Like the light duty world, most heavy duty HVAC systems are tested using a laptop and specific software. However, the Freightliner M2 Business Class Truck HVAC controls and blower motor circuits can still be checked using common items found in most repair shops. Learn more in the July/August 2016 issue of MACS ACTION magazine.

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About macsworldwide

Mobile Air Conditioning Society
(MACS) Worldwide
Founded in 1981, MACS is the leading non-profit trade association for the mobile air conditioning, heating and engine cooling system segment of the automotive aftermarket.
Since 1991, MACS has assisted more than 600,000 technicians to comply with the 1990 U.S. EPA Clean Air Act requirements for certification in refrigerant recovery and recycling to protect the environment. The Mobile Air Conditioning Society (MACS) Worldwide’s mission is clear and focused--as the recognized global authority on mobile air conditioning and heat transfer industry issues.
www.macsw.org